Blood enters the head from three directions:
- Lateral:
(+) trochanteric
(+) cruciate anastomosis.
They reach their
destinations through the retinacula
- Medially from the obturator artery through the ligament of the head of the femur
- From the nutrient arteries running through the medullary cavity
This anastomosis persists even in old age but in 20 % it is never found
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